/*
 * Noise.java
 *
 * Created on February 23, 2005, 10:03 PM
 */

package utils.noise;

import utils.*;
import utils.linear.LDouble;
import utils.linear.LVect2d;
import utils.linear.LVect3d;

/**
 *
 * @author Calvin Ashmore
 */
public class PerlinNoise implements NoiseFunction
{
    //public String toString() { return super.toString()+", "+params.scale + " "+params.translate; }
    
    PerlinNoiseParameters params;
    
    public PerlinNoise()
    {
        //this.params = new PerlinNoiseParameters();
        //initialize();
    }
    
    public void setParameters(PerlinNoiseParameters params) {
        this.params = params;
    }
    
    public PerlinNoise(PerlinNoiseParameters params)
    {
        this.params = params;
        //initialize();
    }
    
    static int p[];
    static int permutation[] = { 151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180 };;
    
    //private void initialize()
    static
    {
        p = new int[512];
        for (int i = 0; i < 256; i++)
            p[256 + i] = p[i] = permutation[i];
    }
    
    /*
    // oddball temp thing
    public double eval1(LDouble x) {return eval(x.val,0,0);}
    public double eval1(double x) {return eval(x,0,0);}
    public double eval1(LVect2d x) {return eval(x.x,x.y,0);}
    public double eval1(double x, double y) {return eval(x,y,0);}
    public double eval1(LVect3d x) {return eval(x.x,x.y,x.z);}
    public double eval1(double x, double y, double z) {return eval(x,y,z);}
    
    public double eval(LDouble x) {return eval(x.val,0,0);}
    public double eval(double x) {return eval(x,0,0);}
    public double eval(LVect2d x) {return eval(x.x,x.y,0);}
    public double eval(double x, double y) {return eval(x,y,0);}
    public double eval(LVect3d x) {return eval(x.x,x.y,x.z);}
    public double eval(double x, double y, double z)
    {
        double o = 1;
        double r=0;
        int i;
        
        x = params.scale.x*x + params.translate.x;
        y = params.scale.y*y + params.translate.y;
        z = params.scale.z*z + params.translate.z;
        
        if(!params.usePowers)
            for(i=0;i<params.octaves;i++)
            {
                r += o*_noise(x,y,z);
                x *= params.lambda;
                y *= params.lambda;
                z *= params.lambda;
                o *= params.omega;
            }
        else
            for(i=0;i<params.octaves;i++)
            {
                double s = Math.pow(i+1,params.lambda);
                r += Math.pow(i+1,-1/params.omega)*_noise(s*x,s*y,s*z);
            }
            
        return r;
    }*/
    
    
    public double noise(LDouble x) {return noise(x.val,0,0);}
    public double noise(double x) {return noise(x,0,0);}
    public double noise(LVect2d x) {return noise(x.x,x.y,0);}
    public double noise(double x, double y) {return noise(x,y,0);}
    public double noise(LVect3d x) {return noise(x.x,x.y,x.z);}
    public double noise(double x, double y, double z)
    {
        return _noise(params.scale.x*x + params.translate.x, 
                      params.scale.y*y + params.translate.y,
                      params.scale.z*z + params.translate.z );
    }
    
    private double _noise(double x, double y, double z)
    {
        int X = (int) Math.floor(x) & 255, // FIND UNIT CUBE THAT
        Y = (int) Math.floor(y) & 255, // CONTAINS POINT.
        Z = (int) Math.floor(z) & 255;
        
        x -= Math.floor(x); // FIND RELATIVE X,Y,Z
        y -= Math.floor(y); // OF POINT IN CUBE.
        z -= Math.floor(z);
        
        double u = fade(x), // COMPUTE FADE CURVES
               v = fade(y), // FOR EACH OF X,Y,Z.
               w = fade(z);
        
        int A = p[X] + Y, AA = p[A] + Z, AB = p[A + 1] + Z, // HASH COORDINATES OF
            B = p[X + 1] + Y, BA = p[B] + Z, BB = p[B + 1] + Z; // THE 8 CUBE CORNERS,

        return lerp(w, lerp(v, lerp(u, grad(p[AA], x, y, z), // AND ADD
            grad(p[BA], x - 1, y, z)), // BLENDED
            lerp(u, grad(p[AB], x, y - 1, z), // RESULTS
            grad(p[BB], x - 1, y - 1, z))), // FROM  8
            lerp(v, lerp(u, grad(p[AA + 1], x, y, z - 1), // CORNERS
            grad(p[BA + 1], x - 1, y, z - 1)), // OF CUBE
            lerp(u, grad(p[AB + 1], x, y - 1, z - 1),
            grad(p[BB + 1], x - 1, y - 1, z - 1))));
    }

    
    public double fade(double t) {return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);}
    double lerp(double t, double a, double b) {return a + t * (b - a);}
    double grad(int hash, double x, double y, double z)
    {
        int h = hash & 15; // CONVERT LO 4 BITS OF HASH CODE
        double u = h < 8 || h == 12 || h == 13 ? x : y, // INTO 12 GRADIENT DIRECTIONS.
               v = h < 4 || h == 12 || h == 13 ? y : z;
        return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
    }
    
}
